[paul alan]

So with so many people converting to hot water lately have opinions changed on the effectiveness of hot water cleaning as opposed to cold water? is it more effective?

I have an immersion but have not used it for more than frost protection as yet.

From watching nathankayes videos I can see the option is there for me to use it for hot water cleaning, but is there any benefit to it??

[dazmond]

hot water is a luxury.just like having a new van with a heated drivers seat,air con,heated windscreen etc....

i like luxury....and i can afford it....but if your just keeping your head above water financially dont bother you can clean fine with cold water.

hot water is actually more effective in the warmer months when the water is up to 50c-60c.it shifts pollen,birdmuck,slug trails,bee spots,greasy residue off the windows easier.you can also splash and dash on some work with a bit more confidence.filthy add on jobs come up better too.i personally think the time saving compared to cold is marginal but its less effort all around.

i forgot just how much easier it is to manage my hoses when ive got hot water pumping through it compared to the 100m of wire that it becomes with cold water on a freezing day.

[The Jester of Wibbly]

It's also a good usp for your business. A lot more compitition in this business over the years and an increase in the numbers moving to hot.  So it's also about keeping up or ahead of your local comp.

A customer searching for a wc will have the luxury of choosing who to go with so the more you have to offer the better.

[paul alan]

I do a lot of research in to anything that will interest me( I know a lot of it is bullshivit) !

It amazes me that with all the hot water hype and the money invested in such, that there exists no such proof of its superiority over cold water???

How simple (in my mind) would it be to clean two windows on the same house in the same condition, one with hot one with cold.
and compare the difference?

Would it not reach hands further into pockets of wfp's if the proof was there in all its glory? I don't get it, if I was selling hot water to the window cleaning masses this would be the ultimate tool in my arsenal.

Maybe no such evidence exists? Maybe prototype videos have been made and discarded due to not proving anything?

I did see a video on youtube about hot water melting away bird mess on a pane, but said bird poop could of been of the easily removed with cold variety. There is no verification.

Are we being fed £5k lies?

Why the fuuaark hasn't a side by side comparison been done to prove a theory???

Why in this day and age, is there not some proof. It seems to be all pseudo placebo.

[Dry Clean]

IF you trust in the method and are already quick then hot water isn't going to make any difference to your daily grind, if your
the type that spends far too much time scrubbing and rinsing then the placebo effect of hot may reduce the time you spend,
its why some see benefits and others don't.

[Marc Stock]

Personally i think hot water is a liability.

Glass can crack if you splosh hot water all over it.in the cold.

[paul alan]

IF you trust in the method and are already quick then hot water isn't going to make any difference to your daily grind, if your
the type that spends far too much time scrubbing and rinsing then the placebo effect of hot may reduce the time you spend,
its why some see benefits and others don't.

So placebo? Do you/have you used hot?

[paul alan]

Personally i think hot water is a liability.

Glass can crack if you splosh hot water all over it.in the cold.

Can cold glass crack with hot on it? what is the heat differential?

[Dry Clean]

I do a lot of research in to anything that will interest me( I know a lot of it is bullshivit) !

It amazes me that with all the hot water hype and the money invested in such, that there exists no such proof of its superiority over cold water???

How simple (in my mind) would it be to clean two windows on the same house in the same condition, one with hot one with cold.
and compare the difference?

Would it not reach hands further into pockets of wfp's if the proof was there in all its glory? I don't get it, if I was selling hot water to the window cleaning masses this would be the ultimate tool in my arsenal.

Maybe no such evidence exists? Maybe prototype videos have been made and discarded due to not proving anything?

I did see a video on youtube about hot water melting away bird mess on a pane, but said bird poop could of been of the easily removed with cold variety. There is no verification.

Are we being fed £5k lies?

Why the fuuaark hasn't a side by side comparison been done to prove a theory???

Why in this day and age, is there not some proof. It seems to be all pseudo placebo.

You get bird poo that sticks like concrete and others that just melt, there lies the problem, was it the hot that done the work or was it just an easy to remove poo.

[Dry Clean]

IF you trust in the method and are already quick then hot water isn't going to make any difference to your daily grind, if your
the type that spends far too much time scrubbing and rinsing then the placebo effect of hot may reduce the time you spend,
its why some see benefits and others don't.

So placebo? Do you/have you used hot?

Yes I had an on demand gas heater and it didn't make the slightest difference to the quality or the speed in which I cleaned,
it did make cleaning dirty fascia's quicker compared to pure from my tank but no difference when compared to using the customers tap with the extra pressure.

[Jonny 87]

I think you’d have to be crazy to think hot water doesn’t clean better than cold. How much better though? There in lies the difficulty.

On 90% of windows Mayb it makes no difference, but it will allow you to work with more confidence as you know that a scrub and a rinse with hot, and every bit of dirt will be gone. Whereas with cold water, it can be easy to miss a pollen spot, snail trail etc.

If nothing else hot water makes your day more comfortable. Just like a powered reel, or extreme pole. Are they necessary? No, but they are a luxury, and make your day easier.

It’s up you yourself to decide if it justifies the cost.

[paul alan]

So if read between the lines correctly. it did make a difference when cleaning dirty fascia comparable to using extra pressure?

[paul alan]

I think you’d have to be crazy to think hot water doesn’t clean better than cold. How much better though? There in lies the difficulty.

On 90% of windows Mayb it makes no difference, but it will allow you to work with more confidence as you know that a scrub and a rinse with hot, and every bit of dirt will be gone. Whereas with cold water, it can be easy to miss a pollen spot, snail trail etc.

If nothing else hot water makes your day more comfortable. Just like a powered reel, or extreme pole. Are they necessary? No, but they are a luxury, and make your day easier.

It’s up you yourself to decide if it justifies the cost.

I think the difference between crazy or not is more than 90% and 100%.

Is confidence another term for placebo?

[Slacky]

If hot isn’t more effective in cleaning why do dishwashers and clothes washers have hot water settings?

Serious question.

[Dry Clean]

So if read between the lines correctly. it did make a difference when cleaning dirty fascia comparable to using extra pressure?

It did seem to remove green crud quicker than 3lts per minute of pure from my tank but if honest the customers tap slightly
beat it.
Thing is hot water does clean better, there's a scientific reason for it, that doesn't mean it will make a difference to what we  are
removing from the glass.

That said there will always be the exceptions. lol.

[Dry Clean]

If hot isn’t more effective in cleaning why do dishwashers and clothes washers have hot water settings?

Serious question.

Dishwashers are removing grease which is hard to remove, clothes will also contain certain things where hot will help but in both cases its the detergent that's doing the major work.

[mufcglen]

I been using hot through the winter months for about 4 years now, summer I don’t really bother as I find the hose is supple enough and the water in the tank isn’t too cold, this past week however I didn’t drain my system form one night and ended up cracking the housing on my 5 year old lpg heater!
Bypassed it and got a days work in, it was cold the hose was a bloody nightmare and the brush didn’t seem to glide as much on the glass.
Anyway got through it all came home ordered a new heater from Germany but I’m mean time I stripped the heater down, fixed the crack with the quick repair putty metal and stuck it back in, back out today and it’s been so much better having the warm water again!
I only run mine about 25-30 degrees as I cracked a window a few years ago just after I started using hot but I was using the heater at something like 60 degrees lol
Been fine ever since and it melts the bird crap, bug poo etc a little better then cold.
I always say try mixing fairy liquid under cold water tap then try it with warm water, everything loosens up very easy!
For the price of a cheap lpg a 18kg tank and a load of extra clips I’d say it’s a no brainer for me

[Slacky]

If hot isn’t more effective in cleaning why do dishwashers and clothes washers have hot water settings?

Serious question.

Dishwashers are removing grease which is hard to remove, clothes will also contain certain things where hot will help but in both cases its the detergent that's doing the major work.

If the detergent is doing the work why use hot.

[Seymour Sunshine]

It isn't an exact science, but it's generally held that every 10 degrees C rise roughly doubles the speed of a chemical reaction. Dissolving/emulsifying stuff is, in essence, a chemical process, so warmer water should do better than cold. And that's why dishwashers etc use hot water rather than cold. It's also why your granny used to boil the bed sheets and towels.

I can only agree that a controlled experiment is really the only way to answer the question once and for all, but it would be difficult to do in the real world. I think that most of us over-clean the windows and probably waste huge amounts of water in the process. I know that I certainly used to use twice the water I use now.

Here's an idea for all you experimenters out there:

1 - smear an equal amount of budgie poo on 4 or 5 windows. Leave it dry for a while.
2 - just use the jet to dissolve it using water at ambient temp, ambient + 5, ambient + 10 etc and see what difference it makes.

Make a video from the other side of the glass of it and post it on youtube. Probably best to do it on your own windows rather than a customer's windows, though. I think it might be quite difficult to explain to Mrs Jones why you're smearing bird poo on her kitchen window! Instead, you can have fun explaining it to your wife and kids if you're blessed with them!

This is only half-serious, by the way.

[Seymour Sunshine]

If hot isn’t more effective in cleaning why do dishwashers and clothes washers have hot water settings?

Serious question.

Dishwashers are removing grease which is hard to remove, clothes will also contain certain things where hot will help but in both cases its the detergent that's doing the major work.

If the detergent is doing the work why use hot.

Ahh!! A scientific question!

A detergent molecule is two-ended. One end is hydrophilic (likes to join to a water molecule), the other end is oleophilic (likes to join to an oil molecule.  So what it does is to effectively remove the oil molecules from substances by joining them to water molecules. It isn't dissolving the oil, it's forming an emulsion.

Here's a fun website to look at all about soaps/detergents: https://www.york.ac.uk/res/sots/activities/soapysci.htm

When you warm stuff up, you're making the molecules move faster ... they have more energy. They therefore react (= join together) more vigorously. That's why fireworks only go off when you light the blue touchpaper ... it warms up the chemicals and they are able to react explosively.

So the answer is that the detergent does its work more quickly when it's hotter.

I LOVE science!

PS Slacky's handle is only partly correct. Hydrogen needs (i) time and (ii) to be made quite warm before it turns into people.